1971 Volume 44 Issue 10 Pages 2756-2760
Strongly-enhanced NMR signals were observed in the photo-induced hydrogen abstraction reaction of phenanthraquinone with several hydrogen donors in benzene. Chemically-induced dynamic nuclear polarization was kinetically treated in the photochemical reaction during the course of irradiation by visible light and shut-off. It was found that the relaxation time of the nuclear-spin system under the irradiation is shorter by a factor of 2 to 4 than that in the black-out stage and that the enhancement factor for the methine proton of the 1,2-adduct of phenanthraquinone was evaluated as 1000–2000.
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